simpleFunctionPython.h

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// Gmsh - Copyright (C) 1997-2022 C. Geuzaine, J.-F. Remacle
//
// See the LICENSE.txt file in the Gmsh root directory for license information.
// Please report all issues on https://gitlab.onelab.info/gmsh/gmsh/issues.
 
#ifndef SIMPLE_FUNCTION_PYTHON_H
#define SIMPLE_FUNCTION_PYTHON_H
 
#include "Python.h"
#include "simpleFunction.h"
 
class simpleFunctionPython : public simpleFunction<double> {
  PyObject *_pycallback;
 
public:
  simpleFunctionPython(PyObject *callback) : _pycallback(callback)
  {
    Py_INCREF(_pycallback);
  }
  ~simpleFunctionPython() { Py_DECREF(_pycallback); }
  double operator()(double x, double y, double z) const
  {
    PyObject *pyargs = Py_BuildValue("(ddd)", x, y, z);
    PyObject *result = PyObject_CallObject(_pycallback, pyargs);
    double r = 0;
    if(result) {
      int ok = PyArg_Parse(result, "d", &r);
      if(ok == 0) Msg::Error("The python function did not return a double.");
      Py_DECREF(result);
    }
    else {
      PyErr_Print();
      Msg::Error("An error occurs in the python simple function.");
    }
    Py_DECREF(pyargs);
    return r;
  }
};
 
#endif